Shock absorber for walking beams



July 4, 1939. c. P. HALL ET AL 2,164,709

SHOCK ABSORBER FOR WALKING BEAMS Filed July 6, 1936 2 Sheets-Sheet 1 F/ya.

INVENTOR BY myzm ATTORNEYS July 4, 1939. c. P. HALL ET AL 2,164,709

snocx ABSORBER FOR WALKING amms Filed July 6, 1936 2 Sheets-Sheet 2mar/Z5 Ha Cfiesfer 5. EM

INVENTOR ATTOR N EYS- Patented July 4, 1939 UNITED STATES .tAi'ENTOFFICE Charles P. Hall and Chester R. Tucker, Pearson, Okla.

Application July 6, 1936, Serial No. 89,224

1 Claim.

This invention relates to shock absorbers especially adapted for deepwell pumps such as em.- ployed in oil fields and which includes awalking beam driven by a band wheel and connected to 5 a sucker rod of apump. Such parts are subjected to excessive shocks due to a rotarymotion being changed to a reciprocatory motion and the tremendous weightand strain on the sucker rod. The present invention has for its primaryobject 10 the provision of a device which will provide an efficientconnection between a walking beam and a sucker rod to absorb shocks andthereby eliminate wear and damage incident thereto.

With these and other objects in View, this invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claimed.

For a complete understanding of our inven- 20 tion, reference is to behad to the following description and accompanying drawings, in whichFigure 1 is a fragmentary side elevation showing a. shock absorberconnected to a fragmentary portion of a walking beam and to afragmentary portion of a sucker rod and constructed in accordance withour invention.

Figure 2 is an end elevation illustrating the same.

Figure 3 is a vertical sectional View illustrating one of the units ofthe shock absorber.

Figure 4 is a view similar to Figure 3 showing a modified form of ourinvention.

Figure 5 is an end elevation illustrating the same.

Figure 6 is a vertical sectional view illustrating the units of thisinvention connected in tandem.

Referring in detail to the drawings, the numeral I indicates afragmentary portion of a walking beam, 2 the sucker rod of a pumpequipped with a coupling element 3. Our invention is employed betweenthe walking beam l and the coupler 3 and consists of units 4 arranged inparallelism and connected to a substantially U-shaped yoke 5 which fitsover the walking beam and rests within a notch provided therefor. Units4 are also connected to the sucker rod by the coupler 3.

Each unit consists of a cylinder 6 having its ends closed by plug-likecaps 1, the caps being provided with openings aligning with each otherand have threaded connections to the cylinder. Any suitable lockingmeans may be provided for securing the caps against accidental removal.Packing 8 is provided in the caps. Rods 9 extend through the caps andone is threaded to the coupler 3 and the other to the yoke 5. The rod 9which is connected to the yoke 5 has secured thereto a disc-like memberforming a spring seat for one end of a coil spring II. The other end ofthe spring bears against one of the plugs l. The other rod has appliedthereto lock nuts l2 engaging with opposite faces of a plug throughwhich said rod extends thereby securing the lat- 5 ter-named rod tothecylinder against movement relative thereto. The disc-like element Illhas a port I3 therethrough through which a fluid may pass during theoperation of the device and which acts to resist the movement of thespring seat. 10 As shown in Figure 3, a coil spring I4 may be arrangedwithin the coil spring H or, as shown in Figure 4, the convolution ofthe spring H may have positioned therebetween a coiled cushion strip [5.The cylinder 6 is provided with a removable plug [6 whereby a liquidlubricant may be placed in the cylinder tolubricate the moving parts andto act as a medium for resisting the movement of the disc-like member10.

The units 4 constructed in accordance with the foregoing and connectedwith the sucker rod and the walking beam will absorb shocks and jars.

If desired, the units may be connected in tandem, as shown in Figure 6.In order to make up a unit in tandem manner a coupling member 5 I? isprovided for joining the cylinders in endwise relation. Also, whenemploying the units in this fashion each cylinder has coil springstherein and the rods that extend into the cylinders carry the disc-likemembers ID for the springs to seat upon.

The device as described combines hydraulic and mechanical features forthe purpose of absorbing shocks and provides a device which will bedurable, easily applied and efficient in operation.

Having described the invention, we claim:

A shock absorber comprising a pair of cylinders open at the endsthereof, apertured removable caps closing said ends of the cylinders,means for admitting fluid in said cylinders, rods slidable throughcertain of the caps of the cylinders and secured to a yoke of a walkingbeam, packing preventing leaks between the latter-named caps and saidrods and arranged in the cylinders, rods extending through andadjustably secured to the other caps of the cylinders and secured to acoupler of a pump operating medium, disc-like members secured on thefirst-named rods within the cylinders and having ports to permit aretarded flow of liquid past said members during 5 the latters movementin said cylinders, and cushion coil springs surrounding the first-namedrods within the cylinders and bearing against the disc-like members andthe caps through which the first-named rods slide and the springs of 5each cylinder being arranged one within the other.

CHARLES P. HALL. CHESTER R'. TUCKER.

